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    SubjectRe: [patch 2/2] enables booting a NUMA system where some nodes have no memory
    On Wed, 15 Nov 2006 16:57:56 -0800 (PST)
    Christoph Lameter <clameter@sgi.com> wrote:
    > numa_node_id() points to this and we always get allocations redirected to
    > other nodes. The slab duplicates its per node structures on the fallback
    > node.
    >
    > > The zonelist[] donen't contain empty-zone.
    >
    > So we will never encounter that zone except when going to the
    > pglist_data struct through numa_node_id()?
    >
    Some pgdat/zone scanning code will access it.
    See: for_each_zone() and populated_zone().

    AFAIK, in 2.6.9 age(means RHEL4), cpus on memory-less-node are moved to the
    nearest node. And there were no useless pgdat.

    Now, there are memory-less-node. Cpus on memory-less-node are on a pgdat
    with empty-zone. I think this is very simple way rather than remapping.
    And I think cpus on memory-less-node are sharing something (FSB,switch,etc..)
    Tieing cpus to a memory-less-node may have some benefit.

    -Kame

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